Food limited survival of larval razorback sucker,Xyrauchen texanus,in the laboratory |
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Authors: | Diana Papoulias Wendell L. Minckley |
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Affiliation: | (1) Department of Zoology, Arizona State University Tempe, AZ, 85287-1501, U.S.A.;(2) Present address: U.S. Fish and Wildlife Service, National Fisheries Contaminant Research Center, 4200 New Haven Rd., Columbia, MO, 65203, U.S.A. |
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Abstract: | Synopsis Razorback suckers in Lake Mohave, Arizona-Nevada, are suffering recruitment failure. Concomitantly, lake zooplankton levels are low and variable. We test, under laboratory conditions, the possibility that starvation is a cause of low recruitment. Razorback sucker larvae that were starved, received food too late, or were provided with insufficient food died between 20 and 30 d after hatching. Yolk absorption was at 8d after hatching, the critical period during which larvae must feed or most will die lies between 8 and 19d, and the point of irreversible starvation for individuals is between 19 and 23 d after hatching. Results support food-related mortality as a contributor to year-class failure of razorback sucker in Lake Mohave. |
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Keywords: | Critical period Starvation Mortality Fish larvae Catostomidae |
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